Bug 62477

mpd starting log this:

Feb  7 11:56:28 cleopatre mpd: mpd: pid 284, version 3.16 (root@cleopatre 01:41  6-Feb-2004)
Feb  7 11:56:28 cleopatre mpd: [test] ppp node is "mpd284-test"
Feb  7 11:56:28 cleopatre mpd: [test] using interface ng0
Feb  7 11:56:28 cleopatre mpd: [test] IPCP: peer address cannot be zero
Feb  7 11:56:28 cleopatre mpd: [test] IFACE: Open event
Feb  7 11:56:28 cleopatre mpd: [test] IPCP: Open event
Feb  7 11:56:28 cleopatre mpd: [test] IPCP: state change Initial --> Starting
Feb  7 11:56:28 cleopatre mpd: [test] IPCP: LayerStart
Feb  7 11:56:28 cleopatre mpd: [test] bundle: OPEN event in state CLOSED
Feb  7 11:56:28 cleopatre mpd: [test] opening link "pppoe"...
Feb  7 11:56:28 cleopatre mpd: [pppoe] link: OPEN event
Feb  7 11:56:28 cleopatre mpd: [pppoe] LCP: Open event
Feb  7 11:56:28 cleopatre mpd: [pppoe] LCP: state change Initial --> Starting
Feb  7 11:56:28 cleopatre mpd: [pppoe] LCP: LayerStart
Feb  7 11:56:28 cleopatre mpd: [pppoe] device: OPEN event in state DOWN
Feb  7 11:56:28 cleopatre mpd: [test] can't connect bypass,link0 and dc0:orphans,mpd284-pppoe: No such file or directory
Feb  7 11:56:28 cleopatre mpd: [test] can't remove hook mpd284-pppoe from node "dc0:orphans": No such file or directory
Feb  7 11:56:28 cleopatre mpd: [pppoe] device is now in state OPENING
Feb  7 11:56:28 cleopatre mpd: [pppoe] device: DOWN event in state OPENING
Feb  7 11:56:28 cleopatre mpd: [pppoe] device is now in state DOWN
Feb  7 11:56:28 cleopatre mpd: [pppoe] link: DOWN event
Feb  7 11:56:28 cleopatre mpd: [pppoe] LCP: Down event
Feb  7 11:56:28 cleopatre mpd: [pppoe] device: OPEN event in state DOWN
Feb  7 11:56:28 cleopatre mpd: [pppoe] pausing 6 seconds before open
Feb  7 11:56:28 cleopatre mpd: [pppoe] device is now in state DOWN

Seems mpd is looking for hook named "orphans"
after this command: 
/usr/sbin/ngctl mkpeer dc0: pppoe orphans ethernet
mpd starts correctly.

Fix: 

workaround:
insert "ngctl mkeeper" command in the start-up script.

definitive: mpd should create "orphans" if it doesn't already exist.
How-To-Repeat: Start mpd after a fresh reboot or
stop mpd if already running.
/usr/sbin/ngctl rmhook your-interface: orphans
start mpd